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2 Sheets-Sheet 1.

A. ARSON.

Steam Engine and Boiler for Tramways. No. 241,586. Patented May 17,1881.

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Steam Engine No. 241,586.

2 Sheets-Sheet 2. 'A. ARSON.

and Boiler for Tramways.

' Patented May 17, I881.

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UNITED STATES PATENT QFFICE.

ALEXANDRE ARSON, or PARIS, FRANCE.

STEAM, ENGINE AND BOILERFOR TRAMWAYS.

SPECIFICATION forming part of Letters Patent No. 241,586, dated May 17, 1881.

7 Application filed August 26, 1878. Patented in England May 13, 1878.

To all whom it may concern .that of the atmosphere.

Be it known that I, ALEXANDRE ARSON, of Paris, Republic of France, have invented certain Improvem cuts in Steam Engines and Boilers for Tramway-Carriages, of which the followingis a specification.

The object of my invention is to so construct the engine and boiler of a tramwayor street car that the said engine and boiler will occupy as small a space as possible on the car, their parts he not complicated, and the obnoxious escape of smoke and exhaust-steam prevented as much as possible. This object I accomplish in the manner which I will nowproeeed to describe, reference being'had to the accompanying drawings, in which- Figure 1, Sheet 1, is a side view of a twostory ear with myimproved engine and boilerattached; Fig. 2, Sheet 2, a longitudinal section of the compound engine; Fig. 3, a transverse section of the same; Fig. 4, a sectional view of one of the valves; Fig. 5, a vertical section ofthe boiler and feed water heater and Figs. 6, 7, and 8, detached views of parts of the boiler.

Referring to Fig. 1, A is the boiler, which is of the vertical type, and occupies a comparatively small space on one side of the front platform of the car,the smoke-pipe F passing down through the feed-water heater G, and thence in a horizontal direction beneath the frame of the car.

0 G represent the compound engine, which is arranged below the platform, and the pistonrods and slide-valves of which are connected.

to cranks on the front axle of the car, as indicated by dotted lines. The piston of the cylinder O of this compound engine is operated by the live steam, while the expanded steam, which passes from this cylinder through the conduitcinto the intermediate chamber, R, acts on the piston in the cylinder 0 in the manner usual in compound expansion engines, the expanded steam, when it leaves the latter cylinder, having a pressure slightly greater than Insome cases, as when the car has to ascend inclines or to pull a heavy load, it becomes desirable to employ greater power than usual. For thispurpose I employ a valve, T, which controls the steampassage 0, and a conduit, t, leading directly from the live-steam chest. This valve T is adapted to be operated bya cam and rod, 15, under the control of the conductor or driver, so that by manipulating this cam the said valve can be caused to close the communication between the expanded-steam passage 0 and the chamber R, and open the passage 1, communicating with the livesteam supply, and hence live steam will be supplied to both cylinders O and C. At the same time that the valve T closes the communication between the passage 0 and the chamber B it opens a communication through which the steam from the cylinder 6 :may exhaust into the atmosphere, Figs. 2 and 4.

Referring to the boiler, Fig. 5, A is the out. er casing,. and E the fire-chamber, into which projects the pendent water-chamber E, and through the latter passes what may be termed the fuel-m agazine]3 On the top of this magazine is arranged a receptacle, 1), for fuel to be supplied to the magazine, this receptacle at the beginning of each trip being supplied with more than sutficient fuel to supply the furnace during the entire trip of the car.

The fire-grate consists of a central hollow imperforate cone, D, immediately under the magazine, to prevent the access of too much air to the fire, this cone being surrounded by annular grate-bars d.

Adjoining the boiler I arrange a vertical feed-water reservoir, Gr, through which passes the smoke-pipe F, so that the products of combustion, in passing out, may impart their heat to the water contained therein. The horizontal pipe H, which communicates with the smoke pipe passing through the feed-water heater, extends under the frame of the car, so that the passengers who ride on the upper deck may be free from the annoyance of smoke, cinders, and steam which escape from the usual vertical smoke-pipes. Into this pipe H projects the end of the exhaust-pipe I from the engine-cylinder O, the expanded steam being under sufficient pressure to create the desired draft. The

bottom of the vertical portion of the smokepipe F, which passes through the feed-water heater G, is closed by a detachable cap, F, by opening which the cinders and soot collected in the pipe may be readily removed.

The boiler communicates by a pipe, M, Fig. 8, with the feed-water heater through the medium of the usual small feed-pump; and in order that the water in the boiler may always be at the proper level, I employ a float, J, Figs. 5 and 6, one end of which is connected by a link, k, with the valve K, forming the communication between the pipe M and the boiler, while the other end of the float is hinged to the side of the boiler at j. When the water is at or below the normal level the float J will be in a position to keep the valve K'open and allow the feed-water to be pumped into the boiler; but when the water rises above the normal level the float will close the valve and shut off the supply of water. The pressure of water in the pipe M will then open a valve, 8, which has been kept closed by a spring, r, of sufficient strength to overcome the pressure of the water so long only as the latter is allowed to pass into the boiler.

In order to prevent the noises and disturbances caused by the ebullition of thewater in the boiler, I arrange in the vertical waterchamber formed between the outer casin g and fire-box, and in the pendent water-chamber,corrugated plates L, Figs. 5 and 8, which efl'ectually prevent the said objectionable. disturbances. I

The above-mentioned construction of vertical boiler with the adjoiningvertical feed-water reservoir,throughwhichthesmoke-pipepasses,

enables me to arrange the parts in the smallest possible space.

I claim as my invention 1. In a dummy or tramway car, the combination of the vertical boiler on the front plat- 3 5 form with the smoke-pipe passing beneath the floor of the car, as and for the purpose set forth.

2. The combination of the vertical boiler with the adjacent vertical feed-water heater and the smoke-pipe passing down through the i'eed- 40 water heater and beneath the floor of the car.

3. The combination of the boiler and feedwater heater with the smoke-pipe F and cap F.

4. The combination, in a boiler, of the firebox E, magazine B, central imperforate cone, 5 D, and annular rings at.

5. In a portable or dummy engine, the combination of the annular water-chamber of the steam-boiler with annular corrugated plates L inside said water-chamber, as and for the pur- 5o pose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALEXANDRE ARSON.

Witnesses:

J OSEPH DEBAGE, R0131. M. HOOPER. 

